This engine is due to be updated, but here is an archival of the 2020 builds.
Archived by Moonchild6279#7271
https://drive.google.com/file/d/1vc2s7IaXjHvpXLwV_F0mTOpwlDPuBoGh/view?usp=sharing
Archived by BlueSpeedster#8319
https://drive.google.com/file/d/1y3AlUd7Qq98SAeONV-T0bD8vIWMYR-Ku/view?usp=sharing
https://drive.google.com/file/d/18XcP2AIj-FtpzctQGhcxVzqwEcVzsmx8/view?usp=sharing
https://drive.google.com/file/d/1U80om1KM1awDet_cCW5NxJp1VnrIfzY-/view?usp=sharing
https://drive.google.com/file/d/1oD_nL8O8D4cwBbzQ_do8n6phIaBLibLX/view?usp=sharing
As of I'm writing these, I'd say these are the best engines you can find for GameMaker. Not the best physics as say Harinezumi, but do the job fairly well.
Mirror: http://www.mediafire.com/file/tn76vy974q68t8b/s8e-v.2.12.zip/file
Alternative Version (Features Homing Attack & Other Features): https://drive.google.com/file/d/1NCz-Uax4JcLz3-trludktemMbF2GelRi/view?usp=sharing
Mirror: http://www.mediafire.com/file/yax5efljf12uw1n/sse.zip/file
https://gamejolt.com/games/Flicky8Engine/458377
MIRROR: https://drive.google.com/file/d/1OCpKpwFUUL3IZq-jL_C1wl0lSsqWAUtM/view?usp=sharing
Sonic 360 Engine Variants: https://drive.google.com/file/d/1CG80CCnlw4X46iPz64D0v7vumuUsoaoR/view?usp=sharing
Sonic Revival Engine Variants: https://drive.google.com/file/d/1SsiAKDv7DBmEb4aAZ-hNGmJX82coqo6n/view?usp=sharing